package com.xidian.edu.cn.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.xidian.edu.cn.common.to.es.SkuESModel;
import com.xidian.edu.cn.common.utils.R;
import com.xidian.edu.cn.search.config.ElasticSearchConfig;
import com.xidian.edu.cn.search.constant.ESConstant;
import com.xidian.edu.cn.search.feign.ProductFeignService;
import com.xidian.edu.cn.search.service.ElasticSearchService;
import com.xidian.edu.cn.search.vo.AttrRespVo;
import com.xidian.edu.cn.search.vo.BrandVo;
import com.xidian.edu.cn.search.vo.SearchParamVo;
import com.xidian.edu.cn.search.vo.SearchRespVo;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.fetch.subphase.highlight.Highlighter;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.naming.directory.SearchResult;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class ElasticSearchServiceImpl implements ElasticSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchRespVo search(SearchParamVo searchParamVo) {

        SearchRespVo searchRespVo = null;
        //1、动态构建DSL语句
        SearchRequest searchRequest = buildSearchRequest(searchParamVo);


        try {
            SearchResponse response = client.search(searchRequest, ElasticSearchConfig.COMMON_OPTIONS);

            //分析响应数据
            searchRespVo = buildSearchResponse(response, searchParamVo);
        } catch (IOException e) {
            e.printStackTrace();
        }


        return null;
    }

    /**
     * 准备检索请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParamVo searchParamVo) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句
        //1、查询：模糊匹配、过滤（属性、分类、品牌、价格区间、库存等）
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1 模糊查询
        if (!StringUtils.isEmpty(searchParamVo.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParamVo.getKeyword()));
        }
        //1.2 按照三级分类id来查询
        if (searchParamVo.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParamVo.getCatalog3Id()));
        }
        //按照品牌id来查询
        if (searchParamVo.getBrandId() != null && searchParamVo.getBrandId().size() > 0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParamVo.getBrandId()));
        }
        //按照是否有库存来查询
        boolQuery.filter(QueryBuilders.termQuery("hasStock", searchParamVo.getHasStock() == 1));
        //按照价格区间
        if (!StringUtils.isEmpty(searchParamVo.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParamVo.getSkuPrice().split("_");
            if (s.length == 2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length == 1){
                if (searchParamVo.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if (searchParamVo.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }
        //按照属性进行查询
        if (searchParamVo.getAttrs() != null && searchParamVo.getAttrs().size() > 0){
            for (String attr : searchParamVo.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//检索属性的值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每个都要生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        sourceBuilder.query(boolQuery);

        //2、排序、分页、高亮
        if (!StringUtils.isEmpty(searchParamVo.getSort())){
            String sort = searchParamVo.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }

        //分页
        sourceBuilder.from((searchParamVo.getPageNum() - 1) * ESConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(ESConstant.PRODUCT_PAGESIZE);

        //高亮
        if (!StringUtils.isEmpty(searchParamVo.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red;'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        //3、聚合分析
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1 品牌的子聚合-品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg")
                .field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg")
                .field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2、按照分类信息进行聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //2. 按照属性信息进行聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //2.1 按照属性ID进行聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_agg.subAggregation(attr_id_agg);
        //2.1.1 在每个属性ID下，按照属性名进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //2.1.1 在每个属性ID下，按照属性值进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        sourceBuilder.aggregation(attr_agg);

        SearchRequest searchRequest = new SearchRequest(new String[]{ESConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }


    /**
     * 构建返回数据
     * @return
     */
    private SearchRespVo buildSearchResponse(SearchResponse response, SearchParamVo searchParamVo) {

        SearchRespVo searchRespVo = new SearchRespVo();

        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuESModel> esModels = new ArrayList<>();
        //遍历所有商品信息
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuESModel esModel = JSON.parseObject(sourceAsString, SkuESModel.class);
                //判断是否按关键字检索，若是就显示高亮，否则不显示
                if (!StringUtils.isEmpty(searchParamVo.getKeyword())) {
                    //拿到高亮信息显示标题
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String skuTitleValue = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(skuTitleValue);
                }
                esModels.add(esModel);
            }
        }
        searchRespVo.setProducts(esModels);

        //2、当前商品涉及到的所有属性信息
        List<SearchRespVo.AttrVo> attrVos = new ArrayList<>();
        //获取属性信息的聚合
        ParsedNested attrsAgg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()) {
            SearchRespVo.AttrVo attrVo = new SearchRespVo.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);

            //2、得到属性的名字
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);

            //3、得到属性的所有值
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> item.getKeyAsString()).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        searchRespVo.setAttrs(attrVos);

        //3、当前商品涉及到的所有品牌信息
        List<SearchRespVo.BrandVo> brandVos = new ArrayList<>();
        //获取到品牌的聚合
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAgg.getBuckets()) {
            SearchRespVo.BrandVo brandVo = new SearchRespVo.BrandVo();

            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //2、得到品牌的名字
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);

            //3、得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            brandVos.add(brandVo);
        }
        searchRespVo.setBrands(brandVos);

        //4、当前商品涉及到的所有分类信息
        //获取到分类的聚合
        List<SearchRespVo.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        for (Terms.Bucket bucket : catalogAgg.getBuckets()) {
            SearchRespVo.CatalogVo catalogVo = new SearchRespVo.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }

        searchRespVo.setCatalogs(catalogVos);
        //===============以上可以从聚合信息中获取====================//
        //5、分页信息-页码
        searchRespVo.setPageNum(searchParamVo.getPageNum());
        //5、1分页信息、总记录数
        long total = hits.getTotalHits().value;
        searchRespVo.setTotal(total);

        //5、2分页信息-总页码-计算
        int totalPages = (int)total % ESConstant.PRODUCT_PAGESIZE == 0 ?
                (int)total / ESConstant.PRODUCT_PAGESIZE : ((int)total / ESConstant.PRODUCT_PAGESIZE + 1);
        searchRespVo.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        searchRespVo.setPageNavs(pageNavs);

        //6、构建面包屑导航
        if (searchParamVo.getAttrs() != null && searchParamVo.getAttrs().size() > 0) {
            List<SearchRespVo.NavVo> collect = searchParamVo.getAttrs().stream().map(attr -> {
                //1、分析每一个attrs传过来的参数值
                SearchRespVo.NavVo navVo = new SearchRespVo.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);

                //远程调用
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));

                if (r.getCode() == 0) {
                    AttrRespVo data = r.getData("attr", new TypeReference<AttrRespVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }

                //2、取消了这个面包屑以后，我们要跳转到哪个地方，将请求的地址url里面的当前置空
                //拿到所有的查询条件，去掉当前
                String replace = replaceQueryString(searchParamVo, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());

            searchRespVo.setNavs(collect);
        }

        //品牌、分类
        if (searchParamVo.getBrandId() != null && searchParamVo.getBrandId().size() > 0){

            List<SearchRespVo.NavVo> navs = searchRespVo.getNavs();
            SearchRespVo.NavVo navVo = new SearchRespVo.NavVo();

            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(searchParamVo.getBrandId());
            if (r.getCode() == 0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(searchParamVo, brandVo.getBrandId() + "", "brandId");

                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);

            //TODO 分类


        }

        return searchRespVo;
    }

    private String replaceQueryString(SearchParamVo searchParamVo, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value,"UTF-8");
            encode.replace("+","%20");  //浏览器对空格的编码和Java不一样，差异化处理
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return searchParamVo.get_queryString().replace("&"+key+"=" + value, "");
    }


}
